搜索结果: 1-15 共查到“理学 crack”相关记录21条 . 查询时间(0.077 秒)
Scientists crack secrets of the monarch butterfly’s internal compass
Scientists monarch butterfly internal compass
2016/4/25
ach fall, monarch butterflies across Canada and the United States turn their orange, black and white-mottled wings toward the Rio Grande and migrate over 2,000 miles to the relative warmth of cen...
Existence of solutions for a higher order non-local equation appearing in crack dynamics
Hydraulic fractures Higher order equation Non-local equation Thin film equation Non-negative solutions periodic Hilbert transform
2015/10/15
In this paper, we prove the existence of non-negative solutions for a non-local higher order degenerate parabolic equation arising in the modeling of hydraulic fractures. The equation is similar to th...
Stanford biologists crack centuries-old mystery of how cell growth triggers cell division
Stanford biologists centuries-old mystery growth triggers cell division
2015/10/13
Cells were discovered in 1676, and almost immediately afterward scientists began wondering why cells are so perfectly small.More than three centuries later, a team of Stanford biologists have zeroed i...
NSF awards $15 million to crack the olfactory code
NSF $15 million crack the olfactory code
2015/9/25
Since the early 19th century, scientists have worked to unravel the mystery of olfaction, the sense of smell.Olfaction is critical for the survival of species across the animal kingdom. Yet how the br...
Computer Scientists at UT Austin Crack Code for Redrawing Bird Family Tree（图）
Computer Scientists UT Austin Crack Code Redrawing Bird Family Tree
2014/12/30
AUSTIN, Texas — A new computational technique developed at The University of Texas at Austin has enabled an international consortium to produce an avian tree of life that points to the origins of...
Local climatic changes impact algae living inside the sea ice, which may drastically affect near shore Arctic marine food webs
Scientists traveled to a town near the top of the world to study a creat...
Solution of Singular Integrals in Mathematical Model of Mode I Crack near Strength Mismatched Interface
Crack Opening Displacement Singular Integrals Strength Mismatch Weld Interface Cauchy’s Principal Value Theorem
2013/1/30
Characteristics of Mode I crack near the interface of elasticity matched but plasticity and strength mismatched materials differ from those of the crack in a homogenous body. Interface body of differe...
The paper presents a model of a dynamic crack with a wavy surface. So far, theoretical analysis of crack front waves has been performed only for in-plane perturbations of the crack front. In the prese...
Weight function in a bimaterial strip containing an interfacial crack and an imperfect interface. Application to Bloch-Floquet analysis in a thin inhomogeneous structure with cracks
Bloch-Floquet waves boundary layer crack imperfect interface weight function
2011/9/22
Abstract: We define a weight function in a bi-material strip containing a semi-infinite crack and an imperfect interface and analyse a problem of anti-plane shear. We then present an asymptotic algori...
Crack Closure and Shape Restoration Using NiTi Shape-Memory Alloy
Crack Closure Shape Memory Alloy Actuator Shape Recovery Shape Restoration Structure Repair
2011/11/22
Because of the high actuation stress and high recovery strain, NiTi shape-memory alloy (SMA) has been proposed for shape/position control and crack closure in structures for many years. In this paper,...
Asymptotic analysis of stresses near a crack tip in a two dimensional colloidal packing saturated with liquid
Asymptotic analysis of stresses two dimensional colloidal
2010/11/24
The consolidation of colloidal particles in drying colloidal dispersions is in-uenced by various factors such as particle size and shape, and inter-particle potential. The capillary pressure induced b...
Study of three-dimensional crack fronts under plane stress using a phase field model
Materials Science (cond-mat.mtrl-sci) Other Condensed Matter (cond-mat.other) Pattern Formation and Solitons (nlin.PS)
2010/11/11
The shape of a crack front propagating through a thin sample is studied using a phase field model. The model is shown to have a well defined sharp interface limit. The crack front is found to be an el...
Ultimate crack and lack of any security in the statistical key exchange protocol with random signals and feedback
Ultimate crack Quantum Physics
2010/11/8
We deterministically crack the secure, statistical key exchange protocol based on feedback proposed by Pao-Lo Liu [ J. Lightwave Techology 27 (2009) pp. 5230-34]. The crack is ultimate and absolute be...
Some dynamic propagation problems concerning mode III crack
complex functions mode Ⅲ crack
2010/9/17
By the methods of the theory of complex functions, dynamic propagation problems concerning mode Ⅲ crack were investigated. Analytical solutions can be obtained by the approaches of self-similar functi...
The pecularities of shear crack pre-rupture evolution and distribution of seismicity before strong earthquakes
shear crack pre-rupture evolution seismicity strong earthquakes
2009/12/9
Several methods are presently suggested for investigating pre-earthquake evolution of the regions of high tectonic activity based on analysis of the seismicity spatial distribution. Some precursor sig...